VOF with a moving mesh

Hello, I'm working on a fuel jet (300-500pph) impacting a rotating flat disk or cup (20000-40000rpm, D=4cm). The thickness and the velocity of the liquid film developing on the rotating disk are of interest. The injection is stationnary, only the disk is moving. I have made several researches on the Internet and in the scientific literature, in order to know which model(s) I have to use in Fluent. It turns out that the VOF Model is ideal to track the liquid-gas interface (and thus the liquid thickness). Then I chose a moving mesh to simulate the rotation of the disk. It seems possible to use both models (VOF and Moving Mesh) in the same time. And the first results were not so bad, but now I want more precise solutions, so I created a boundary layer on the surface of the disk. The point is that the courant number increases when the fuel jet enters the smallest cells of the mesh (closed to the disk), and the computation stops.

I guess the problem comes from the minimum cell size and/or the time step. But it would be very helpful if somebody has an experience with this kind of problems (VOF + Moving Mesh). Is it possible to get accurate solutions using these models together? And then, what are the key parameters? Any comments can help.